NBC renews '30 Rock' and 'Parenthood,' adds two new series

NBC's veteran series"30 Rock"and "Parenthood" have been picked up for another season, and the network this fall will add two other series, "Do No Harm" and "Infamous," the network announced.

The new season of "30 Rock" -- its seventh and final season -- will be abbreviated, with only 13 episodes. "Parenthood" will be entering its fourth season.

"Do No Harm" is a medical drama that puts a twist on the classic Dr. Jekyll and Mr. Hyde story, revolving around a neurosurgeon with a dark alter-ego. "Infamous" features a female detective who goes undercover to the rich family she grew up in — as the maid's daughter — to solve the murder of the heiress who had been her best friend.